JP2005507686A - Device for delivering biomaterials - Google Patents

Abstract

A device for delivering small spheres of biomaterial into a determined portion of a bone including a cylindrical hollow body of inside diameter D 1 having a filling first end and a second end provided with a snap-fastener, a shutter-forming guide rod having a main portion that is cylindrical with an outside diameter D 2 and presenting an enlarged cylindrical portion suitable for co-operating with the snap-fastener of the body, and a piston constituted by a cylindrical part presenting an outside diameter D 3 and an axial bore of diameter D 4 . The diameter D 3 is slightly smaller than the inside diameter D 1 of the body and the inside diameter D 4 is slightly greater than the diameter D 2 of the rod in such a manner that, once the snap-fastener has been released, the rod can slide inside the piston, and the piston can slide inside the body.

Description

【Technical field】
[0001]
The present invention relates to a device for delivering biomaterial globules to a predetermined site of bone.
[Background]
[0002]
To deliver a specific implant or orthopedic structure, such as a screw plate system, to a specific bone site, such as the upper femur (femoral metaphysis), first drill a hole in the spiral This hole must then be plugged with the implant or orthopedic structure, i.e. with the screw and plate cylinder in the particular case. In order to securely place the implant or orthopedic structure into the hole, it is necessary to insert the biomaterial and secure the orthopedic structure before inserting the screw or implant.
[0003]
Currently, the holes are filled with biomaterials manually using curettes. The curette is moved to gradually block the missing part of the bone and the biomaterial is pushed in multiple directions using a graft-pusher to spread better in the hole. The presence of biomaterial in the hole is monitored with an image intensifier.
[0004]
The screw is then slid onto the pin, and then the pin is advanced to the center of the biomaterial, which is undesirably impacted with the biomaterial (friction or disassembly of the biomaterial, possibly within the screw). There is a risk that the metal particles may peel off) or the biomaterial may be scattered inside the upper end of the femur. Moreover, it takes about 15 minutes to close the hole with the biomaterial by this method.
[0005]
From this it can be seen that the above method of delivering biomaterials into a hole using a curette and graft pusher has many drawbacks. In particular, the above method takes a long time for a surgical operation because confirmation work is particularly required. Furthermore, it is difficult to correctly and reliably spread the biomaterial into the hole.
DISCLOSURE OF THE INVENTION
[Problems to be solved by the invention]
[0006]
In view of the above, there is a real need for an apparatus for delivering biomaterials to a predetermined site in bone that can quickly fill the holes with the biomaterial and can be well distributed in the holes.
[Means for Solving the Problems]
[0007]
In order to achieve this object, the present invention is a device for delivering a sphere of biomaterial to a predetermined site of bone, comprising:
A cylindrical hollow body having an inner diameter D1, having a first filling end and a clasp at the second end;
-A shutter-type guide rod whose main part is cylindrical with an outer diameter D2, having a cylindrical extension in the vicinity of its second end, and this part in cooperation with the clasp of the barrel; A shutter-type guide rod which is suitable for temporarily fixing the rod in the body part; and a piston comprising a cylindrical part having an outer diameter of D3 and an inner diameter of D4. The outer diameter D3 is slightly smaller than the inner diameter D1 of the body and the inner diameter D4 is slightly larger than the outer diameter D2 of the rod. When the clasp is removed, the rod enters a small ball into the piston. Piston composed of a cylindrical portion that can be slid without slipping, and can be slid without penetrating a small ball into the annular space between the rod and the body portion ;
A device characterized by comprising:
[0008]
It will be appreciated that the barrel of the device can be moved relative to the rod, and more precisely to the shutter-type cylindrical extension, so that the hole location can be accurately located and the spheres can be delivered. It will also be seen that the outer diameter of the piston is smaller than the inner diameter of the barrel, and therefore smaller than the diameter of the hole, so that small spheres of biomaterial can be well distributed on the wall of the hole.
[0009]
In a preferred embodiment, the rod has a shaft hole at the second end having an extension,
The shaft hole extends at least partway along the rod.
[0010]
Since the shaft hole is opened in the rod, the entire device can be inserted into the hole by arranging the pin in the hole in advance and using this to guide the entire device.
[0011]
Preferably, the first filling end of the hollow body is widened by a truncated conical recess recessed toward the shaft hole of the body. As described above, since the funnel is opened, the small space can be more easily filled into the annular space between the body portion and the rod in the manner of the funnel.
[0012]
Also preferably, the clasp at the second end of the barrel is a longitudinal groove formed within the second end of the barrel and at the second end of the barrel. Including a relief part protruding into the shaft hole,
A groove for receiving the relief portion of the body portion is substantially formed on the cylindrical side surface of the cylindrical extension portion of the rod.
BEST MODE FOR CARRYING OUT THE INVENTION
[0013]
Other features and advantages of the present invention will be better understood from a reading of the following description of a preferred embodiment of the invention, given by way of illustration. In addition, this invention is not limited only to these illustrations. The description refers to the accompanying figures.
FIG. 1 is an elevational view from above of a body of a device for delivering biomaterials.
FIG. 1A is an external view of the end of the body shown in FIG.
FIG. 2 is an elevation view of the piston.
FIG. 2A is an external view of the end of the piston shown in FIG.
FIG. 3 is an elevational view of the rod and shutter.
FIG. 3A is an external view of the end of the rod shown in FIG.
FIG. 4 shows the first stage of use of the device, placing a sphere of biomaterial.
FIG. 5 shows the subsequent steps of moving the piston into the body of the device.
FIG. 6 shows the subsequent stage of use, where the biomaterial globules flow out by moving the barrel away from the end of the rod.
FIG. 7 shows the final state of the device, where the piston releases all the globules at once into a hole drilled in the bone.
[0014]
1-3, the various parts of the device for delivering biomaterial globules will be described in detail.
[0015]
1 and 1A, the body of the device can be seen. The trunk | drum 10 is comprised from the tubular part 12 which has the axial hole 14 of internal diameter D1, so that FIG. At the first end 16 of this tubular portion there is a longitudinal groove, such as 18, between which there is a tongue-like portion 20 which can be deformed in a telescopic manner. On the inner surface 20a, the tongue-shaped portions are each provided with a clasp-type relief portion 22 which is used as a part of the clasp as will be described later. The second end 24 of the barrel 10 preferably has a funnel-shaped extension 26, which has a frustoconical shape that is recessed in the form of a funnel towards the axial hole 14 of the barrel 10. There is a recess (28).
[0016]
2 and 2A show a piston 30 which is the second component in a device for delivering small spheres of biomaterial. This piston also consists essentially of a tubular part 32 with a shaft hole 34 open. The diameter of the shaft hole 34 is D4, while the outer diameter of the piston 30 is D3. The outer diameter D3 is slightly smaller than the diameter D1 so that the piston can slide into the body without “penetrating” a small sphere of biomaterial. The first end 36 of the piston 30 preferably has a longitudinal groove on its outer surface such as 38 that extends partway through the piston. At the other end 40 of the piston 30 is an extrusion 42. The length L3 of the piston 30 is longer than the length L1 of the trunk portion 10.
[0017]
3 and 3A show the rod of the device of the present invention. The main portion of the rod has an outer diameter D2, and its length L2 is considerably longer than the length L1 of the body portion and the length L3 of the piston. The rod 50 is preferably provided with a shaft hole 52 at least halfway, preferably in the whole. In the vicinity of the end 54 of the rod 50, there is an annular portion 56 having a diameter D′ 2 that is considerably larger than the diameter D2 of the rod. The annular portion 56 preferably has an annular groove 58 having a function described later. The diameter of the end portion 60 of the rod 50 is also increased, but is smaller than the diameter D′ 2 of the expansion portion 56. Since the diameter D2 is slightly smaller than the diameter D4 of the shaft hole of the piston, it does not “enter” the small sphere of the biomaterial.
[0018]
The various components of the device for delivering the biomaterial are preferably made of steel with the properties required for surgical tools.
[0019]
With reference now to FIGS. 4-7, a method of using the device for delivering biomaterial globules into a hole in the bone will be described.
[0020]
FIG. 4 shows the rod 50 in the body 10 of the device. In this position, the shutter-type extension 56 of the rod 50 is fastened to the body 10 of the device by a clasp receiver 22 which is linked to the groove 58 of the extension 56. As can be seen from the figure, this assembled part delimits an annular space 70 between the wall of the body 10 and the outer periphery of the rod 50, which is closed with the shutter 56 of the rod 50 at the lower end. Yes. The funnel-shaped portion 28 is used to introduce the required amount of biomaterial globules 72 into the annular space 70. Thereafter, as shown in FIG. 5, the piston 30 is pushed in, and the shaft hole 34 of the piston is engaged with the rod 50. The piston 30 is pushed into the shaft hole of the body 10 while the small sphere 72 of the biomaterial is lightly compressed.
[0021]
In the next stage, as partially shown in FIG. 6, the device assembled in the state shown in FIG. 5 is inserted into a hole drilled in the bone. The device can be pushed into the hole to the position of the distal end 60 of the rod, thereby ensuring correct delivery of the device. At the next stage, the body 10 is moved away from the shutter 56 of the rod 50 while the rod is fixed. When the rod is released from the body 10 in this way, an opening 74 is formed between the shutter 56 and the lower end 12a of the body 10. Through this opening 74, the biomaterial globules 72 can flow out of the originally confined space. By pushing the piston 30 against the barrel 10 while keeping the barrel 10 in the correct position, the small sphere 72 can be easily delivered into the hole. Further, when the piston is pushed, the small sphere 72 can be pushed against the inner wall. It should also be added that when the piston 30 is rotated about its axis, the presence of the flutes 38 on the outer surface of the piston allows better delivery and distribution of the globules 72 on the hole walls.
[0022]
It should also be mentioned that due to the shaft hole 52 in the rod 50, the device can be guided along a guide pin previously placed in the hole.
[0023]
In a preferred embodiment of the device, the inner diameter D1 of the barrel is about 13 mm. The length L1 is about 145 mm.
[0024]
The outer diameter D3 of the piston 30 is about 12.4 mm, which is smaller than the inner diameter D1 of the body portion 10, the diameter of the shaft hole of the piston is about 5 mm, and the outer diameter D2 of the rod 50 is slightly larger than about 4.4 mm.
[0025]
Needless to say, the diameters D1, D2, D3, and D4 vary depending on the outer diameter of the trunk 10 of the device, and the outer diameter of the trunk itself is determined by the diameter of the hole formed in the bone. The diameter of the hole is usually 14 mm.
[Brief description of the drawings]
[0026]
FIG. 1 is an elevational view from above of a torso of a device for delivering biomaterials. FIG. 1A is an external view of the end of the body shown in FIG.
FIG. 2 is an elevation view of a piston. FIG. 2A is an external view of the end of the piston shown in FIG.
FIG. 3 is an elevational view of a rod and a shutter. FIG. 3A is an external view of the end of the rod shown in FIG.
FIG. 4 shows the first stage of use of the device, placing a sphere of biomaterial.
FIG. 5 shows the subsequent steps of moving the piston into the body of the device.
FIG. 6 shows a subsequent stage of use in which the biomaterial globules flow out by moving the barrel away from the end of the rod.
FIG. 7 shows the final state of the device where the piston releases all the globules at once into a hole drilled in the bone.
[Explanation of symbols]
[0027]
10, hollow barrel 12, barrel tubular portion 12 a, barrel lower end 14, barrel shaft hole 16, barrel second end 18, longitudinal groove 20, clasp 20 a, tongue-like Inner surface 22 of the part, relief 24, barrel first filling end 26, barrel extension 28, funnel-shaped portion 30, piston 32, piston cylinder 34, piston shaft hole 36, piston First end 38, longitudinal groove 40, piston second end 42, extrusion 50, shutter-type guide rod 52, rod shaft hole 54, rod second end 56, rod extension 58, groove 60, rod end 70, annular space 72, biomaterial sphere 74, opening D1, barrel inner diameter D2, rod outer diameter D'2, rod extension diameter D3, piston outer diameter D4 , The inner diameter L1 of the piston, the length L2 of the body portion, the length L3 of the main portion of the rod, Piston length

Claims (5)

A device for delivering small spheres of biomaterial to a predetermined site in bone,
A cylindrical hollow body (10) having an inner diameter D1, having a first filling end (24) and having a clasp (20) at the second end (16);
A shutter-type guide rod (50) whose main part is cylindrical with an outer diameter D2, having a cylindrical extension (56) in the vicinity of its second end (54), this part being a barrel A shutter-type guide rod (50) suitable for temporarily fixing the rod in the barrel by cooperating with the clasp (20) of the rod; and-the outer diameter is D3 and the inner diameter Is a piston (30) composed of a cylindrical portion (32) having a shaft hole of D4, the outer diameter D3 is slightly smaller than the inner diameter D1 of the trunk portion (10), and the inner diameter D4 is smaller than the outer diameter D2 of the rod. It is slightly larger, and when the clasp is removed, the rod can slide without entering a small ball into the piston, and the piston is annular between the rod and the body. Slide without letting small balls enter the space And a cylindrical portion (32) which can be a piston (30);
The apparatus characterized by including. The rod (50) has an axial hole (52) at the second end (54) having an extension (56),
The apparatus according to claim 1, wherein the shaft hole extends at least partway along the rod. The first filling end (24) of the hollow body (10) is widened by a frustoconical recess (28) that is recessed toward the axial hole of the body. 2. The apparatus according to 2. The clasp at the second end (16) of the barrel (10) includes a longitudinal groove (18) made in the second end of the barrel and a second end of the barrel. And a relief (22) projecting into the shaft hole,
The groove (58) for receiving the relief part of the said trunk | drum is substantially made in the cylindrical side surface of the cylindrical expansion part (56) of the said rod (50), The Claim 1 characterized by the above-mentioned. 4. The apparatus according to any one of items 3. Device according to any one of the preceding claims, characterized in that there is a longitudinal groove (38) on the outer surface in the vicinity of the second end of the piston (30).

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